JP3168228B2 - Method of forming helical spline with stopper for rotary shaft and rolling tool therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a helical spline with a stopper for a rotary shaft, which is fitted with a driven body and is secured by a helical spline, and a tool for rolling the helical spline.

[0002]

2. Description of the Related Art For example, a helical spline with a stopper is provided on the output shaft of a starting motor as shown in Japanese Utility Model Laid-Open Publication No. 55-53727, and a sleeve portion of a clutch outer of an overrunning clutch is splined. ,
In some cases, the stopper is prevented from coming out in the axial direction by a stopper.

[0003] Such a conventional method of forming a helical spline with a stopper for a rotating shaft is as shown in FIG. First, as shown in FIG. 5A, a round bar material such as a steel material is subjected to cold forging and cutting to form a flange portion 1a and a relief portion 1.
b, a large-diameter portion 1c and a small-diameter portion 1d are formed, and the processed shaft 1 is obtained. Next, as shown in FIG. 5B, the large-diameter portion 1c of the work shaft 1 is sandwiched between a pair of rolling tools 2 and pressure-rolled. The pair of rolling tools 2 are provided such that the inclination directions of the teeth are opposite to each other.

The rolling tool 2 is shown in an exploded view in FIG. Reference numeral 3 denotes a helical tooth body provided with a plurality of helical teeth 3a, and 4 denotes a plurality of continuous teeth 4 continuous with every other helical tooth 3a of the helical tooth body 3.
a is a continuous toothed body provided with a. The helical tooth body 3 and the continuous tooth body 4 are integrally connected as shown in FIG.

FIG. 5C shows a rotary shaft on which a helical spline with a stopper is formed by rolling as shown in FIG. 5B. The large diameter portion 1c of the rotating shaft 5 has a plurality of sections (for example, 10
Helical spline 6 having a helical groove 6a
Thus, a communication groove 7a communicating with the helical groove 6a every other line and a stopper portion 7 left between the communication grooves 7a in the circumferential direction are formed. Helical groove 6 thus formed
A small flash 8 was generated at the boundary between the communication groove 7a and the communication groove 7a. This is because the rolling tool 2 connects the helical tooth body 3 and the continuous tooth body 4, but there is a small gap between both mating surfaces due to processing accuracy, so that the formed helical groove 6a is formed. Burrs 8 are formed at the borders with the communication grooves 7a. When the burrs 8 are provided, the driven body is hindered from being hooked when the driven body is axially inserted from the outside for spline connection.
In addition, the burrs 8 may come off and enter the engagement portion of the spline, and the driven body may have a sliding failure. For this reason, the burrs 8 have been removed by hand finishing.

In order to prevent the burrs 8 from being generated in the helical groove 6a as described above, another conventional method for forming a helical spline with a stopper is shown in FIG. First, as shown in FIG. 7A, a round bar material such as a steel material is subjected to cold forging and cutting to form a flange portion 1a and a relief portion 1.
b, a large-diameter portion 1e, an annular groove 1f, a stopper portion 1g, and a small-diameter portion 1d are formed. The outer diameter of the annular groove 1f is smaller than the root diameter of the helical groove 6a and the communication groove 7a after rolling. Next, similarly to FIG. 5B, the large diameter portion 1e of the work shaft 1 and the stopper portion 1g are sandwiched between a pair of rolling tools 2, and pressure rolling is performed. Thus, as shown in FIG. 7B, the rotating shaft 9 has a helical spline 6 having a plurality of helical grooves 6a, a communication groove 7a communicating with every other helical groove 6a, and a communication groove 7a. The stopper portion 7 left in the circumferential direction is formed. In the rolling process, the seam between the helical tooth body 3 and the continuous tooth body 4 of the rolling tool 2 is located at the position 1f of the annular groove, so that no burrs are generated.

[0007]

In the conventional method of forming a helical spline with a stopper for a rotary shaft as described above, the method shown in FIG. 5 generates a flash 8 at the boundary between the spline groove 6a and the communication groove 7a. This requires a work for removing the slag, and there is a problem that productivity is reduced. Further, in the method of FIG. 7 in which this is eliminated, forming the annular groove 1f in the shaft 1 to be processed by cutting would increase the number of processing steps. Furthermore, since the annular groove 1f is provided, the formed helical spline 6 has a short spline connection with the clutch outer of the overrunning clutch, and the surface pressure increases. To cope with this, if the helical spline is lengthened by the groove width of the annular groove 1f, there is a problem that the length of the rotating shaft 9 becomes longer accordingly.

The present invention has been made to solve such a problem, and a helical spline with a stopper is formed in a single rolling process without an annular groove, and a spline groove and a communication groove are formed. It is an object of the present invention to provide a method for forming a helical spline with a stopper for a rotary shaft which does not require the removal of burrs at the boundary of the boundary, eliminates the need for burrs, and does not increase the shaft length, and a rolling tool therefor.

[0009]

According to the present invention, there is provided a method of forming a helical spline with a stopper for a rotating shaft, comprising: a plurality of helical teeth; a continuous tooth located at the front of the helical teeth and connected to every other helical tooth; A pair of rolling tools having, at the post-process side positions of these helical teeth and the continuous teeth, alternate helical teeth and continuous teeth connected to the helical teeth having a plurality of finished teeth at equal pitches. , A large diameter portion of the shaft to be processed is sandwiched, and pressing is applied while rolling the workpiece by the movement of both rolling tools, and a plurality of helical grooves are formed in the large diameter portion and a front portion of the helical groove. In addition, a communication groove communicating with every other line and a stopper portion left between these communication grooves are formed. The rolling tool includes a helical tooth body provided with a plurality of helical teeth, and a continuous tooth formed at a front portion of the helical tooth body and formed with continuous teeth connected to every other helical tooth. And a plurality of vanish-finished teeth having the same pitch are formed on the alternate helical teeth and the continuous teeth connected to the helical teeth and the continuous teeth, which are located on the post-process side of the helical teeth and the continuous teeth. And the finished tooth body thus integrally formed.

[0010]

In the present invention, when the large diameter portion of the shaft to be processed is rolled while being sandwiched between a pair of rolling tools, a plurality of helical grooves and a communication groove continuous with every other helical groove are formed. , Only
Also at this time, burrs occur at the border between both grooves,
Is crushed and removed by the veneer finishing teeth located on the post-process side, and is finished into a smoothly communicating groove. Thereby, the driven body having the helical teeth on the inner periphery is axially passed through the communication groove of the rotation shaft from the outside, and is smoothly coupled to the helical groove.

[0011]

【Example】

Embodiment 1 FIG. FIG. 1 shows a method for forming a spline with a stopper for a rotary shaft according to an embodiment of the present invention. The shaft 1 to be processed has a flange 1a, a relief 1b, a large-diameter portion 1c, and a small-diameter portion 1d formed by cold forging and cutting as in FIG. The large-diameter portion 1c of the work shaft 1 is sandwiched between a pair of rolling tools 10 and is subjected to pressure rolling. A pair of rolling tools 10
Are mounted so as to be rotated by 180 ° with respect to the shaft to be processed.

An exploded view of the rolling tool 10 is shown in FIG. Reference numeral 11 denotes a helical tooth body provided with a plurality of helical teeth 11a. Reference numeral 12 denotes a plurality of continuous teeth 12a which are located in front of the helical tooth body 11 and are continuous with the helical tooth 11a every other line. The provided continuous tooth body 13 is located on the post-process side of the helical tooth body 11 and the continuous tooth body 12, and has the same pitch as the alternate helical tooth 11a and the continuous tooth 12a connected thereto. It is a finished tooth portion 13 provided with a plurality of vanish finished teeth 13a. FIG. 2 (B)
As shown in FIG. 5, a continuous tooth body 12 is connected to the front part of the helical tooth body 11, and a finishing tooth body 13 is integrally connected to a post-process side of the tooth bodies 11, 12, and is rolled. A tool 10 is configured.

FIG. 3 shows a rotary shaft on which the helical spline with stopper is rolled as shown in FIG. Rotating shaft 14
Has a plurality of (for example, 10) helical grooves 1
Spline 15 having helical groove 5a and helical groove 1
5a and the communication grooves 16a and the communication grooves 1
The stopper portion 16 left in the circumferential direction of 6a is formed. Communicating that communicated with the helical groove 15a Paragraph every
The burrs formed at the boundary of the passage groove 16a are formed by rolling.
For the finish finish teeth 13a of the finish tooth portion 13 of the tool 10
Crushed strongly by the rolling action
Processed.

Embodiment 2 FIG. FIG. 4 shows a rolling tool according to Embodiment 2 of the present invention. FIG. 4A is an exploded view, and the helical tooth body 11 is provided with a plurality of helical teeth 11a. Reference numeral 18 denotes a toothed body in which a continuous toothed body 19 and a finished toothed body 20 on the subsequent process side are integrally formed. Continuous tooth part 1
9 is provided with a plurality of continuous teeth 19a which are continuous with the helical teeth 11a every other line.
a is provided with a plurality of vanish finishing teeth 20a of equal pitch. As shown in FIG. 4B, the helical tooth body 1
1, the tooth body 18 is closely connected to the front part and the post-process side,
A rolling tool 17 is configured. One of the rolling tools 17
The helical spline with a stopper is rolled with the large-diameter portion 1c of the shaft 1 to be processed sandwiched therebetween, as in FIG. In addition,
The pair of rolling tools 17 are 180 ° with respect to the axis to be machined.
Rotated and mounted.

[0015]

As described above, according to the first aspect of the present invention,
For example, the large-diameter part, the large-diameter part,
Is sandwiched between a pair of rolling tools, and the movement of both rolling tools
Pressing while rolling the shaft to be machined, multiple
Helical groove and this helical groove at the front and every other
And a stopper left between the communication grooves
Of forming helical spline with stopper for forming a part
At the boundary between the helical groove and the communication groove
For crushing and removing burrs by burnishing
And the sliding connection of the driven body is facilitated,
Also eliminates the previously required artificial deburring work
Manufacturing costs are reduced. Further, according to claim 2, the above
A tool for performing the method of claim 1, wherein the helical tooth is provided.
In the post-process side position of the body and the continuous tooth body,
Helical teeth on every other line of the body, and continuous teeth on the continuous tooth body
Finished teeth with multiple finish finish teeth at equal pitch
Combined parts, rolling of finish finish teeth
It works properly on burrs. Finishing teeth on rolling tools
The effect that it is provided by a simple structure of joining the bodies
There is fruit.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a method for forming a helical spline with a stopper of a rotary shaft according to Embodiment 1 of the present invention.

FIG. 2A is an exploded perspective view of the rolling tool of FIG. 1;
(B) is a perspective view of a rolling tool obtained by combining the parts of (A).

FIG. 3 is a partially sectional front view of a rotating shaft having a helical spline with a stopper according to the forming method of FIG. 1;

FIG. 4A is an exploded perspective view of a rolling tool according to Embodiment 2 of the present invention, and FIG. 4B is a perspective view of a rolling tool obtained by combining the components of FIG.

FIG. 5 is a view sequentially illustrating a conventional method of forming a helical spline with a stopper for a rotating shaft.

6 (A) is an exploded perspective view of the rolling tool of FIG. 5 (B), and FIG. 6 (B) is a perspective view of a rolling tool obtained by combining the parts of FIG. 5 (A).

FIG. 7 is a view sequentially showing another conventional method for forming a helical spline with a stopper for a rotating shaft.

[Explanation of symbols]

 1 Worked shaft 1c Large diameter section 1d Small diameter section 10, 17 Rolling tool 11 Helical tooth body 11a Helical tooth 12, 19 Continuous tooth body 12a, 19a Continuous tooth 13, 20 Finishing tooth body 13a, 20a Vanish finish tooth 14 Rotary shaft 15 Helical spline 15a Helical groove 16 Stopper part 16a Communication groove 18 Tooth body

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigetake Aoyagi 3-12 Kamiyama, Kamo-cho, Toyohashi-shi, Aichi Prefecture OSG Corporation Toyohashi Plant (72) Inventor Shuzo Ijosumi 840 Chiyoda-cho, Himeji-shi Mitsubishi Himeji Electric Machinery Co., Ltd. (72) Inventor Noriyuki Tanaka 840 Chiyodacho, Himeji City Mitsubishi Electric Co., Ltd. Document JP-A-2-22443 (JP, A) JP-A-60-72630 (JP, A) JP-A-4-319037 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21H 5/00 B21H 1/00

Claims (2)

(57) [Claims] 1. A processing shaft having a large diameter portion, a small diameter portion and the like.
The large diameter part is sandwiched between a pair of rolling tools,
Pressing while rolling the work shaft by the movement of the tool, large diameter
Part of the helical groove and the front part of the helical groove
And a communication groove that communicates with every other line, and is left between the communication grooves.
Helical splice with stopper forming a stopper part
In the method of forming the helical groove, the helical groove and the
The flash generated at the boundary with the communication groove communicating with the
It is specially characterized by crushing and removal by burnishing.
A method of forming a helical spline with a stopper for a rotating shaft. Wherein a helical tooth portion body helical teeth of equal pitch are provided in plural rows, Toka this front position above the helical teeth 1 Article every other trailing teeth trailing teeth is provided leading to the unit body
A helical tooth body and a continuous tooth.
At the post-process side position with the body, one section of the helical tooth body
Helical tooth and the same pitch as the continuous tooth of the continuous tooth body
Finished tooth body with multiple finish finish teeth
A helical spline rolling tool with a stopper, characterized in that: